From eb86be5424d4c08e686d5e578b72a26c516ae58a Mon Sep 17 00:00:00 2001 From: Harrison Metzger Date: Thu, 14 Aug 2008 11:29:32 -0500 Subject: USB: Added driver for a Delcom USB 7-segment LED Display Added basic support for a Delcom USB 7-segment LED Display Signed-off by: Harrison Metzger Signed-off-by: Greg Kroah-Hartman --- Documentation/usb/misc_usbsevseg.txt | 46 ++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 Documentation/usb/misc_usbsevseg.txt (limited to 'Documentation/usb') diff --git a/Documentation/usb/misc_usbsevseg.txt b/Documentation/usb/misc_usbsevseg.txt new file mode 100644 index 0000000..0f6be4f --- /dev/null +++ b/Documentation/usb/misc_usbsevseg.txt @@ -0,0 +1,46 @@ +USB 7-Segment Numeric Display +Manufactured by Delcom Engineering + +Device Information +------------------ +USB VENDOR_ID 0x0fc5 +USB PRODUCT_ID 0x1227 +Both the 6 character and 8 character displays have PRODUCT_ID, +and according to Delcom Engineering no queryable information +can be obtained from the device to tell them apart. + +Device Modes +------------ +By default, the driver assumes the display is only 6 characters +The mode for 6 characters is: + MSB 0x06; LSB 0x3f +For the 8 character display: + MSB 0x08; LSB 0xff +The device can accept "text" either in raw, hex, or ascii textmode. +raw controls each segment manually, +hex expects a value between 0-15 per character, +ascii expects a value between '0'-'9' and 'A'-'F'. +The default is ascii. + +Device Operation +---------------- +1. Turn on the device: + echo 1 > /sys/bus/usb/.../powered +2. Set the device's mode: + echo $mode_msb > /sys/bus/usb/.../mode_msb + echo $mode_lsb > /sys/bus/usb/.../mode_lsb +3. Set the textmode: + echo $textmode > /sys/bus/usb/.../textmode +4. set the text (for example): + echo "123ABC" > /sys/bus/usb/.../text (ascii) + echo "A1B2" > /sys/bus/usb/.../text (ascii) + echo -ne "\x01\x02\x03" > /sys/bus/usb/.../text (hex) +5. Set the decimal places. + The device has either 6 or 8 decimal points. + to set the nth decimal place calculate 10 ** n + and echo it in to /sys/bus/usb/.../decimals + To set multiple decimals points sum up each power. + For example, to set the 0th and 3rd decimal place + echo 1001 > /sys/bus/usb/.../decimals + + -- cgit v1.1